Using a complex analysis, Dr. Stevenson showed that increasing girls’ sports participation had a direct effect on women’s education and employment. She found that the changes set in motion by Title IX explained about 20 percent of the increase in women’s education and about 40 percent of the rise in employment for 25-to-34-year-old women.

“It’s not just that the people who are going to do well in life play sports, but that sports help people do better in life,” she said, adding, “While I only show this for girls, it’s reasonable to believe it’s true for boys as well.”

Robert Kaestner, an economics professor at the University of Illinois at Chicago, compared rates of obesity and physical activity of women who had been in high school in the 1970s — as Title IX was taking effect — with similar women from earlier years. Controlling the results for other influences, like age and changing diets, Dr. Kaestner was able to tease out the effects Title IX had on women’s health.

He found that the increase in girls’ athletic participation caused by Title IX was associated with a 7 percent lower risk of obesity 20 to 25 years later, when women were in their late 30s and early 40s. His article was published this month in the journal Evaluation Review.

Interesting studies from the perspective of life course health development.